WISC-III CORRELATIONS WITH THE WIAT

Correlations between WISC-III IQs and Index scores with the eight achi evement subscales of the WIAT were investigated for a sample of 202 st udents with specific learning disabilities, 115 students with mental r etardation, and 159 students who failed to qualify for special educati on services (total N = 476). Corrected correlations between the WISC-I II Full Scale IQ and WIAT subtests indicated differences with the corr elations reported in the WIAT manual. Interestingly, our relationships were generally higher than those previously reported. Only on one sub test, Basic Reading, were significantly lower correlations than those reported in the WIAT manual present. Correlations between the Verbal C omprehension and Perceptual Organization Index scores and WIAT subtest s were almost all lower than those calculated between the Verbal and P erformance IQs and WIAT subtests. Implications are discussed, especial ly those involving the use of correlations between ability and achieve ment measures in regression formulas.